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August 5, 2015

Homework Help: Physics 11 Forces Unit

Posted by Jessie on Thursday, December 19, 2013 at 2:44pm.

I'm not sure if my answers are correct. Your help will be greatly appreciated. Thanks in advanced!

1. two very large cruise ships each have a mass of 415000 tonnes. If they were docked side by side, 1.0m apart, their centres would be 60m apart. What is the force of gravitational attraction putting them together? (hint: 1 tonne=1000kg)

2. On Earth, the gravitational field intensity is 9.8 N/kh. Mercury has a mass of 3.28x10^23kg abd a radius of 2.57x10^6m/ Calculate the gravitational field intensity on Mercury N/kg.

3. What would the weight of the dog be if it was taken to Mercury? (the weight of the dog is 245N and the mass is 25kg)

for #1 I got 3x10^-9, for #2 i got 8.5x10^15 and for #3 I got 2.1x10^17. I don't think I got these answers correct.

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